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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    <a name="line.17"></a>
<FONT color="green">018</FONT>    package org.apache.commons.net.tftp;<a name="line.18"></a>
<FONT color="green">019</FONT>    <a name="line.19"></a>
<FONT color="green">020</FONT>    import java.io.IOException;<a name="line.20"></a>
<FONT color="green">021</FONT>    import java.io.InterruptedIOException;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.net.DatagramPacket;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.net.SocketException;<a name="line.23"></a>
<FONT color="green">024</FONT>    <a name="line.24"></a>
<FONT color="green">025</FONT>    import org.apache.commons.net.DatagramSocketClient;<a name="line.25"></a>
<FONT color="green">026</FONT>    <a name="line.26"></a>
<FONT color="green">027</FONT>    /***<a name="line.27"></a>
<FONT color="green">028</FONT>     * The TFTP class exposes a set of methods to allow you to deal with the TFTP<a name="line.28"></a>
<FONT color="green">029</FONT>     * protocol directly, in case you want to write your own TFTP client or<a name="line.29"></a>
<FONT color="green">030</FONT>     * server.  However, almost every user should only be concerend with<a name="line.30"></a>
<FONT color="green">031</FONT>     * the {@link org.apache.commons.net.DatagramSocketClient#open  open() },<a name="line.31"></a>
<FONT color="green">032</FONT>     * and {@link org.apache.commons.net.DatagramSocketClient#close  close() },<a name="line.32"></a>
<FONT color="green">033</FONT>     * methods. Additionally,the a<a name="line.33"></a>
<FONT color="green">034</FONT>     * {@link org.apache.commons.net.DatagramSocketClient#setDefaultTimeout setDefaultTimeout() }<a name="line.34"></a>
<FONT color="green">035</FONT>     *  method may be of importance for performance tuning.<a name="line.35"></a>
<FONT color="green">036</FONT>     * &lt;p&gt;<a name="line.36"></a>
<FONT color="green">037</FONT>     * Details regarding the TFTP protocol and the format of TFTP packets can<a name="line.37"></a>
<FONT color="green">038</FONT>     * be found in RFC 783.  But the point of these classes is to keep you<a name="line.38"></a>
<FONT color="green">039</FONT>     * from having to worry about the internals.<a name="line.39"></a>
<FONT color="green">040</FONT>     * &lt;p&gt;<a name="line.40"></a>
<FONT color="green">041</FONT>     * &lt;p&gt;<a name="line.41"></a>
<FONT color="green">042</FONT>     * @author Daniel F. Savarese<a name="line.42"></a>
<FONT color="green">043</FONT>     * @see org.apache.commons.net.DatagramSocketClient<a name="line.43"></a>
<FONT color="green">044</FONT>     * @see TFTPPacket<a name="line.44"></a>
<FONT color="green">045</FONT>     * @see TFTPPacketException<a name="line.45"></a>
<FONT color="green">046</FONT>     * @see TFTPClient<a name="line.46"></a>
<FONT color="green">047</FONT>     ***/<a name="line.47"></a>
<FONT color="green">048</FONT>    <a name="line.48"></a>
<FONT color="green">049</FONT>    public class TFTP extends DatagramSocketClient<a name="line.49"></a>
<FONT color="green">050</FONT>    {<a name="line.50"></a>
<FONT color="green">051</FONT>        /***<a name="line.51"></a>
<FONT color="green">052</FONT>         * The ascii transfer mode.  Its value is 0 and equivalent to NETASCII_MODE<a name="line.52"></a>
<FONT color="green">053</FONT>         ***/<a name="line.53"></a>
<FONT color="green">054</FONT>        public static final int ASCII_MODE = 0;<a name="line.54"></a>
<FONT color="green">055</FONT>    <a name="line.55"></a>
<FONT color="green">056</FONT>        /***<a name="line.56"></a>
<FONT color="green">057</FONT>         * The netascii transfer mode.  Its value is 0.<a name="line.57"></a>
<FONT color="green">058</FONT>         ***/<a name="line.58"></a>
<FONT color="green">059</FONT>        public static final int NETASCII_MODE = 0;<a name="line.59"></a>
<FONT color="green">060</FONT>    <a name="line.60"></a>
<FONT color="green">061</FONT>        /***<a name="line.61"></a>
<FONT color="green">062</FONT>         * The binary transfer mode.  Its value is 1 and equivalent to OCTET_MODE.<a name="line.62"></a>
<FONT color="green">063</FONT>         ***/<a name="line.63"></a>
<FONT color="green">064</FONT>        public static final int BINARY_MODE = 1;<a name="line.64"></a>
<FONT color="green">065</FONT>    <a name="line.65"></a>
<FONT color="green">066</FONT>        /***<a name="line.66"></a>
<FONT color="green">067</FONT>         * The image transfer mode.  Its value is 1 and equivalent to OCTET_MODE.<a name="line.67"></a>
<FONT color="green">068</FONT>         ***/<a name="line.68"></a>
<FONT color="green">069</FONT>        public static final int IMAGE_MODE = 1;<a name="line.69"></a>
<FONT color="green">070</FONT>    <a name="line.70"></a>
<FONT color="green">071</FONT>        /***<a name="line.71"></a>
<FONT color="green">072</FONT>         * The octet transfer mode.  Its value is 1.<a name="line.72"></a>
<FONT color="green">073</FONT>         ***/<a name="line.73"></a>
<FONT color="green">074</FONT>        public static final int OCTET_MODE = 1;<a name="line.74"></a>
<FONT color="green">075</FONT>    <a name="line.75"></a>
<FONT color="green">076</FONT>        /***<a name="line.76"></a>
<FONT color="green">077</FONT>         * The default number of milliseconds to wait to receive a datagram<a name="line.77"></a>
<FONT color="green">078</FONT>         * before timing out.  The default is 5000 milliseconds (5 seconds).<a name="line.78"></a>
<FONT color="green">079</FONT>         ***/<a name="line.79"></a>
<FONT color="green">080</FONT>        public static final int DEFAULT_TIMEOUT = 5000;<a name="line.80"></a>
<FONT color="green">081</FONT>    <a name="line.81"></a>
<FONT color="green">082</FONT>        /***<a name="line.82"></a>
<FONT color="green">083</FONT>         * The default TFTP port according to RFC 783 is 69.<a name="line.83"></a>
<FONT color="green">084</FONT>         ***/<a name="line.84"></a>
<FONT color="green">085</FONT>        public static final int DEFAULT_PORT = 69;<a name="line.85"></a>
<FONT color="green">086</FONT>    <a name="line.86"></a>
<FONT color="green">087</FONT>        /***<a name="line.87"></a>
<FONT color="green">088</FONT>         * The size to use for TFTP packet buffers.  Its 4 plus the<a name="line.88"></a>
<FONT color="green">089</FONT>         * TFTPPacket.SEGMENT_SIZE, i.e. 516.<a name="line.89"></a>
<FONT color="green">090</FONT>         ***/<a name="line.90"></a>
<FONT color="green">091</FONT>        static final int PACKET_SIZE = TFTPPacket.SEGMENT_SIZE + 4;<a name="line.91"></a>
<FONT color="green">092</FONT>    <a name="line.92"></a>
<FONT color="green">093</FONT>        /*** A buffer used to accelerate receives in bufferedReceive() ***/<a name="line.93"></a>
<FONT color="green">094</FONT>        private byte[] __receiveBuffer;<a name="line.94"></a>
<FONT color="green">095</FONT>    <a name="line.95"></a>
<FONT color="green">096</FONT>        /*** A datagram used to minimize memory allocation in bufferedReceive() ***/<a name="line.96"></a>
<FONT color="green">097</FONT>        private DatagramPacket __receiveDatagram;<a name="line.97"></a>
<FONT color="green">098</FONT>    <a name="line.98"></a>
<FONT color="green">099</FONT>        /*** A datagram used to minimize memory allocation in bufferedSend() ***/<a name="line.99"></a>
<FONT color="green">100</FONT>        private DatagramPacket __sendDatagram;<a name="line.100"></a>
<FONT color="green">101</FONT>    <a name="line.101"></a>
<FONT color="green">102</FONT>        /***<a name="line.102"></a>
<FONT color="green">103</FONT>         * A buffer used to accelerate sends in bufferedSend().<a name="line.103"></a>
<FONT color="green">104</FONT>         * It is left package visible so that TFTPClient may be slightly more<a name="line.104"></a>
<FONT color="green">105</FONT>         * efficient during file sends.  It saves the creation of an<a name="line.105"></a>
<FONT color="green">106</FONT>         * additional buffer and prevents a buffer copy in _newDataPcket().<a name="line.106"></a>
<FONT color="green">107</FONT>         ***/<a name="line.107"></a>
<FONT color="green">108</FONT>        byte[] _sendBuffer;<a name="line.108"></a>
<FONT color="green">109</FONT>    <a name="line.109"></a>
<FONT color="green">110</FONT>    <a name="line.110"></a>
<FONT color="green">111</FONT>        /***<a name="line.111"></a>
<FONT color="green">112</FONT>         * Returns the TFTP string representation of a TFTP transfer mode.<a name="line.112"></a>
<FONT color="green">113</FONT>         * Will throw an ArrayIndexOutOfBoundsException if an invalid transfer<a name="line.113"></a>
<FONT color="green">114</FONT>         * mode is specified.<a name="line.114"></a>
<FONT color="green">115</FONT>         * &lt;p&gt;<a name="line.115"></a>
<FONT color="green">116</FONT>         * @param mode  The TFTP transfer mode.  One of the MODE constants.<a name="line.116"></a>
<FONT color="green">117</FONT>         * @return  The TFTP string representation of the TFTP transfer mode.<a name="line.117"></a>
<FONT color="green">118</FONT>         ***/<a name="line.118"></a>
<FONT color="green">119</FONT>        public static final String getModeName(int mode)<a name="line.119"></a>
<FONT color="green">120</FONT>        {<a name="line.120"></a>
<FONT color="green">121</FONT>            return TFTPRequestPacket._modeStrings[mode];<a name="line.121"></a>
<FONT color="green">122</FONT>        }<a name="line.122"></a>
<FONT color="green">123</FONT>    <a name="line.123"></a>
<FONT color="green">124</FONT>        /***<a name="line.124"></a>
<FONT color="green">125</FONT>         * Creates a TFTP instance with a default timeout of DEFAULT_TIMEOUT,<a name="line.125"></a>
<FONT color="green">126</FONT>         * a null socket, and buffered operations disabled.<a name="line.126"></a>
<FONT color="green">127</FONT>         ***/<a name="line.127"></a>
<FONT color="green">128</FONT>        public TFTP()<a name="line.128"></a>
<FONT color="green">129</FONT>        {<a name="line.129"></a>
<FONT color="green">130</FONT>            setDefaultTimeout(DEFAULT_TIMEOUT);<a name="line.130"></a>
<FONT color="green">131</FONT>            __receiveBuffer = null;<a name="line.131"></a>
<FONT color="green">132</FONT>            __receiveDatagram = null;<a name="line.132"></a>
<FONT color="green">133</FONT>        }<a name="line.133"></a>
<FONT color="green">134</FONT>    <a name="line.134"></a>
<FONT color="green">135</FONT>        /***<a name="line.135"></a>
<FONT color="green">136</FONT>         * This method synchronizes a connection by discarding all packets that<a name="line.136"></a>
<FONT color="green">137</FONT>         * may be in the local socket buffer.  This method need only be called<a name="line.137"></a>
<FONT color="green">138</FONT>         * when you implement your own TFTP client or server.<a name="line.138"></a>
<FONT color="green">139</FONT>         * &lt;p&gt;<a name="line.139"></a>
<FONT color="green">140</FONT>         * @exception IOException if an I/O error occurs.<a name="line.140"></a>
<FONT color="green">141</FONT>         ***/<a name="line.141"></a>
<FONT color="green">142</FONT>        public final void discardPackets() throws IOException<a name="line.142"></a>
<FONT color="green">143</FONT>        {<a name="line.143"></a>
<FONT color="green">144</FONT>            int to;<a name="line.144"></a>
<FONT color="green">145</FONT>            DatagramPacket datagram;<a name="line.145"></a>
<FONT color="green">146</FONT>    <a name="line.146"></a>
<FONT color="green">147</FONT>            datagram = new DatagramPacket(new byte[PACKET_SIZE], PACKET_SIZE);<a name="line.147"></a>
<FONT color="green">148</FONT>    <a name="line.148"></a>
<FONT color="green">149</FONT>            to = getSoTimeout();<a name="line.149"></a>
<FONT color="green">150</FONT>            setSoTimeout(1);<a name="line.150"></a>
<FONT color="green">151</FONT>    <a name="line.151"></a>
<FONT color="green">152</FONT>            try<a name="line.152"></a>
<FONT color="green">153</FONT>            {<a name="line.153"></a>
<FONT color="green">154</FONT>                while (true)<a name="line.154"></a>
<FONT color="green">155</FONT>                    _socket_.receive(datagram);<a name="line.155"></a>
<FONT color="green">156</FONT>            }<a name="line.156"></a>
<FONT color="green">157</FONT>            catch (SocketException e)<a name="line.157"></a>
<FONT color="green">158</FONT>            {<a name="line.158"></a>
<FONT color="green">159</FONT>                // Do nothing.  We timed out so we hope we're caught up.<a name="line.159"></a>
<FONT color="green">160</FONT>            }<a name="line.160"></a>
<FONT color="green">161</FONT>            catch (InterruptedIOException e)<a name="line.161"></a>
<FONT color="green">162</FONT>            {<a name="line.162"></a>
<FONT color="green">163</FONT>                // Do nothing.  We timed out so we hope we're caught up.<a name="line.163"></a>
<FONT color="green">164</FONT>            }<a name="line.164"></a>
<FONT color="green">165</FONT>    <a name="line.165"></a>
<FONT color="green">166</FONT>            setSoTimeout(to);<a name="line.166"></a>
<FONT color="green">167</FONT>        }<a name="line.167"></a>
<FONT color="green">168</FONT>    <a name="line.168"></a>
<FONT color="green">169</FONT>    <a name="line.169"></a>
<FONT color="green">170</FONT>        /***<a name="line.170"></a>
<FONT color="green">171</FONT>         * This is a special method to perform a more efficient packet receive.<a name="line.171"></a>
<FONT color="green">172</FONT>         * It should only be used after calling<a name="line.172"></a>
<FONT color="green">173</FONT>         * {@link #beginBufferedOps  beginBufferedOps() }.  beginBufferedOps()<a name="line.173"></a>
<FONT color="green">174</FONT>         * initializes a set of buffers used internally that prevent the new<a name="line.174"></a>
<FONT color="green">175</FONT>         * allocation of a DatagramPacket and byte array for each send and receive.<a name="line.175"></a>
<FONT color="green">176</FONT>         * To use these buffers you must call the bufferedReceive() and<a name="line.176"></a>
<FONT color="green">177</FONT>         * bufferedSend() methods instead of send() and receive().  You must<a name="line.177"></a>
<FONT color="green">178</FONT>         * also be certain that you don't manipulate the resulting packet in<a name="line.178"></a>
<FONT color="green">179</FONT>         * such a way that it interferes with future buffered operations.<a name="line.179"></a>
<FONT color="green">180</FONT>         * For example, a TFTPDataPacket received with bufferedReceive() will<a name="line.180"></a>
<FONT color="green">181</FONT>         * have a reference to the internal byte buffer.  You must finish using<a name="line.181"></a>
<FONT color="green">182</FONT>         * this data before calling bufferedReceive() again, or else the data<a name="line.182"></a>
<FONT color="green">183</FONT>         * will be overwritten by the the call.<a name="line.183"></a>
<FONT color="green">184</FONT>         * &lt;p&gt;<a name="line.184"></a>
<FONT color="green">185</FONT>         * @return The TFTPPacket received.<a name="line.185"></a>
<FONT color="green">186</FONT>         * @exception InterruptedIOException  If a socket timeout occurs.  The<a name="line.186"></a>
<FONT color="green">187</FONT>         *       Java documentation claims an InterruptedIOException is thrown<a name="line.187"></a>
<FONT color="green">188</FONT>         *       on a DatagramSocket timeout, but in practice we find a<a name="line.188"></a>
<FONT color="green">189</FONT>         *       SocketException is thrown.  You should catch both to be safe.<a name="line.189"></a>
<FONT color="green">190</FONT>         * @exception SocketException  If a socket timeout occurs.  The<a name="line.190"></a>
<FONT color="green">191</FONT>         *       Java documentation claims an InterruptedIOException is thrown<a name="line.191"></a>
<FONT color="green">192</FONT>         *       on a DatagramSocket timeout, but in practice we find a<a name="line.192"></a>
<FONT color="green">193</FONT>         *       SocketException is thrown.  You should catch both to be safe.<a name="line.193"></a>
<FONT color="green">194</FONT>         * @exception IOException  If some other I/O error occurs.<a name="line.194"></a>
<FONT color="green">195</FONT>         * @exception TFTPPacketException If an invalid TFTP packet is received.<a name="line.195"></a>
<FONT color="green">196</FONT>         ***/<a name="line.196"></a>
<FONT color="green">197</FONT>        public final TFTPPacket bufferedReceive() throws IOException,<a name="line.197"></a>
<FONT color="green">198</FONT>                    InterruptedIOException, SocketException, TFTPPacketException<a name="line.198"></a>
<FONT color="green">199</FONT>        {<a name="line.199"></a>
<FONT color="green">200</FONT>            __receiveDatagram.setData(__receiveBuffer);<a name="line.200"></a>
<FONT color="green">201</FONT>            __receiveDatagram.setLength(__receiveBuffer.length);<a name="line.201"></a>
<FONT color="green">202</FONT>            _socket_.receive(__receiveDatagram);<a name="line.202"></a>
<FONT color="green">203</FONT>    <a name="line.203"></a>
<FONT color="green">204</FONT>            return TFTPPacket.newTFTPPacket(__receiveDatagram);<a name="line.204"></a>
<FONT color="green">205</FONT>        }<a name="line.205"></a>
<FONT color="green">206</FONT>    <a name="line.206"></a>
<FONT color="green">207</FONT>        /***<a name="line.207"></a>
<FONT color="green">208</FONT>         * This is a special method to perform a more efficient packet send.<a name="line.208"></a>
<FONT color="green">209</FONT>         * It should only be used after calling<a name="line.209"></a>
<FONT color="green">210</FONT>         * {@link #beginBufferedOps  beginBufferedOps() }.  beginBufferedOps()<a name="line.210"></a>
<FONT color="green">211</FONT>         * initializes a set of buffers used internally that prevent the new<a name="line.211"></a>
<FONT color="green">212</FONT>         * allocation of a DatagramPacket and byte array for each send and receive.<a name="line.212"></a>
<FONT color="green">213</FONT>         * To use these buffers you must call the bufferedReceive() and<a name="line.213"></a>
<FONT color="green">214</FONT>         * bufferedSend() methods instead of send() and receive().  You must<a name="line.214"></a>
<FONT color="green">215</FONT>         * also be certain that you don't manipulate the resulting packet in<a name="line.215"></a>
<FONT color="green">216</FONT>         * such a way that it interferes with future buffered operations.<a name="line.216"></a>
<FONT color="green">217</FONT>         * For example, a TFTPDataPacket received with bufferedReceive() will<a name="line.217"></a>
<FONT color="green">218</FONT>         * have a reference to the internal byte buffer.  You must finish using<a name="line.218"></a>
<FONT color="green">219</FONT>         * this data before calling bufferedReceive() again, or else the data<a name="line.219"></a>
<FONT color="green">220</FONT>         * will be overwritten by the the call.<a name="line.220"></a>
<FONT color="green">221</FONT>         * &lt;p&gt;<a name="line.221"></a>
<FONT color="green">222</FONT>         * @param packet  The TFTP packet to send.<a name="line.222"></a>
<FONT color="green">223</FONT>         * @exception IOException  If some  I/O error occurs.<a name="line.223"></a>
<FONT color="green">224</FONT>         ***/<a name="line.224"></a>
<FONT color="green">225</FONT>        public final void bufferedSend(TFTPPacket packet) throws IOException<a name="line.225"></a>
<FONT color="green">226</FONT>        {<a name="line.226"></a>
<FONT color="green">227</FONT>            _socket_.send(packet._newDatagram(__sendDatagram, _sendBuffer));<a name="line.227"></a>
<FONT color="green">228</FONT>        }<a name="line.228"></a>
<FONT color="green">229</FONT>    <a name="line.229"></a>
<FONT color="green">230</FONT>    <a name="line.230"></a>
<FONT color="green">231</FONT>        /***<a name="line.231"></a>
<FONT color="green">232</FONT>         * Initializes the internal buffers. Buffers are used by<a name="line.232"></a>
<FONT color="green">233</FONT>         * {@link #bufferedSend  bufferedSend() } and<a name="line.233"></a>
<FONT color="green">234</FONT>         * {@link #bufferedReceive  bufferedReceive() }.  This<a name="line.234"></a>
<FONT color="green">235</FONT>         * method must be called before calling either one of those two<a name="line.235"></a>
<FONT color="green">236</FONT>         * methods.  When you finish using buffered operations, you must<a name="line.236"></a>
<FONT color="green">237</FONT>         * call {@link #endBufferedOps  endBufferedOps() }.<a name="line.237"></a>
<FONT color="green">238</FONT>         ***/<a name="line.238"></a>
<FONT color="green">239</FONT>        public final void beginBufferedOps()<a name="line.239"></a>
<FONT color="green">240</FONT>        {<a name="line.240"></a>
<FONT color="green">241</FONT>            __receiveBuffer = new byte[PACKET_SIZE];<a name="line.241"></a>
<FONT color="green">242</FONT>            __receiveDatagram =<a name="line.242"></a>
<FONT color="green">243</FONT>                new DatagramPacket(__receiveBuffer, __receiveBuffer.length);<a name="line.243"></a>
<FONT color="green">244</FONT>            _sendBuffer = new byte[PACKET_SIZE];<a name="line.244"></a>
<FONT color="green">245</FONT>            __sendDatagram =<a name="line.245"></a>
<FONT color="green">246</FONT>                new DatagramPacket(_sendBuffer, _sendBuffer.length);<a name="line.246"></a>
<FONT color="green">247</FONT>        }<a name="line.247"></a>
<FONT color="green">248</FONT>    <a name="line.248"></a>
<FONT color="green">249</FONT>        /***<a name="line.249"></a>
<FONT color="green">250</FONT>         * Releases the resources used to perform buffered sends and receives.<a name="line.250"></a>
<FONT color="green">251</FONT>         ***/<a name="line.251"></a>
<FONT color="green">252</FONT>        public final void endBufferedOps()<a name="line.252"></a>
<FONT color="green">253</FONT>        {<a name="line.253"></a>
<FONT color="green">254</FONT>            __receiveBuffer = null;<a name="line.254"></a>
<FONT color="green">255</FONT>            __receiveDatagram = null;<a name="line.255"></a>
<FONT color="green">256</FONT>            _sendBuffer = null;<a name="line.256"></a>
<FONT color="green">257</FONT>            __sendDatagram = null;<a name="line.257"></a>
<FONT color="green">258</FONT>        }<a name="line.258"></a>
<FONT color="green">259</FONT>    <a name="line.259"></a>
<FONT color="green">260</FONT>    <a name="line.260"></a>
<FONT color="green">261</FONT>        /***<a name="line.261"></a>
<FONT color="green">262</FONT>         * Sends a TFTP packet to its destination.<a name="line.262"></a>
<FONT color="green">263</FONT>         * &lt;p&gt;<a name="line.263"></a>
<FONT color="green">264</FONT>         * @param packet  The TFTP packet to send.<a name="line.264"></a>
<FONT color="green">265</FONT>         * @exception IOException  If some  I/O error occurs.<a name="line.265"></a>
<FONT color="green">266</FONT>         ***/<a name="line.266"></a>
<FONT color="green">267</FONT>        public final void send(TFTPPacket packet) throws IOException<a name="line.267"></a>
<FONT color="green">268</FONT>        {<a name="line.268"></a>
<FONT color="green">269</FONT>            _socket_.send(packet.newDatagram());<a name="line.269"></a>
<FONT color="green">270</FONT>        }<a name="line.270"></a>
<FONT color="green">271</FONT>    <a name="line.271"></a>
<FONT color="green">272</FONT>    <a name="line.272"></a>
<FONT color="green">273</FONT>        /***<a name="line.273"></a>
<FONT color="green">274</FONT>         * Receives a TFTPPacket.<a name="line.274"></a>
<FONT color="green">275</FONT>         * &lt;p&gt;<a name="line.275"></a>
<FONT color="green">276</FONT>         * @return The TFTPPacket received.<a name="line.276"></a>
<FONT color="green">277</FONT>         * @exception InterruptedIOException  If a socket timeout occurs.  The<a name="line.277"></a>
<FONT color="green">278</FONT>         *       Java documentation claims an InterruptedIOException is thrown<a name="line.278"></a>
<FONT color="green">279</FONT>         *       on a DatagramSocket timeout, but in practice we find a<a name="line.279"></a>
<FONT color="green">280</FONT>         *       SocketException is thrown.  You should catch both to be safe.<a name="line.280"></a>
<FONT color="green">281</FONT>         * @exception SocketException  If a socket timeout occurs.  The<a name="line.281"></a>
<FONT color="green">282</FONT>         *       Java documentation claims an InterruptedIOException is thrown<a name="line.282"></a>
<FONT color="green">283</FONT>         *       on a DatagramSocket timeout, but in practice we find a<a name="line.283"></a>
<FONT color="green">284</FONT>         *       SocketException is thrown.  You should catch both to be safe.<a name="line.284"></a>
<FONT color="green">285</FONT>         * @exception IOException  If some other I/O error occurs.<a name="line.285"></a>
<FONT color="green">286</FONT>         * @exception TFTPPacketException If an invalid TFTP packet is received.<a name="line.286"></a>
<FONT color="green">287</FONT>         ***/<a name="line.287"></a>
<FONT color="green">288</FONT>        public final TFTPPacket receive() throws IOException, InterruptedIOException,<a name="line.288"></a>
<FONT color="green">289</FONT>                    SocketException, TFTPPacketException<a name="line.289"></a>
<FONT color="green">290</FONT>        {<a name="line.290"></a>
<FONT color="green">291</FONT>            DatagramPacket packet;<a name="line.291"></a>
<FONT color="green">292</FONT>    <a name="line.292"></a>
<FONT color="green">293</FONT>            packet = new DatagramPacket(new byte[PACKET_SIZE], PACKET_SIZE);<a name="line.293"></a>
<FONT color="green">294</FONT>    <a name="line.294"></a>
<FONT color="green">295</FONT>            _socket_.receive(packet);<a name="line.295"></a>
<FONT color="green">296</FONT>    <a name="line.296"></a>
<FONT color="green">297</FONT>            return TFTPPacket.newTFTPPacket(packet);<a name="line.297"></a>
<FONT color="green">298</FONT>        }<a name="line.298"></a>
<FONT color="green">299</FONT>    <a name="line.299"></a>
<FONT color="green">300</FONT>    <a name="line.300"></a>
<FONT color="green">301</FONT>    }<a name="line.301"></a>




























































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